package cn.chint.util;


import java.awt.BasicStroke;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Shape;
import java.awt.geom.RoundRectangle2D;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.OutputStream;
import java.util.Hashtable;
import java.util.Random;

import javax.imageio.ImageIO;
 

import com.google.zxing.BarcodeFormat;
import com.google.zxing.BinaryBitmap;
import com.google.zxing.DecodeHintType;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatReader;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.Result;
import com.google.zxing.common.BitMatrix;
import com.google.zxing.common.HybridBinarizer;
import com.google.zxing.qrcode.decoder.ErrorCorrectionLevel;



public class QRCodeUtil {
	
private static final String CHARSET = "utf-8";
private static final String FORMAT_NAME = "JPG";
// 二维码尺寸
private static final int QRCODE_SIZE = 200;
// LOGO宽度
private static final int WIDTH = 60;
// LOGO高度
private static final int HEIGHT = 60;


/**
 * 生成二维码
 * @param content	源内容
 * @param imgPath	生成二维码保存的路径
 * @param needCompress	是否要压缩
 * @return		返回二维码图片
 * @throws Exception
 */
private static BufferedImage createImage(String content, String imgPath, boolean needCompress) throws Exception {
	Hashtable hints = new Hashtable();
	hints.put(EncodeHintType.ERROR_CORRECTION, ErrorCorrectionLevel.H);
	hints.put(EncodeHintType.CHARACTER_SET, CHARSET);
	hints.put(EncodeHintType.MARGIN, 1);
	BitMatrix bitMatrix = new MultiFormatWriter().encode(content, BarcodeFormat.QR_CODE, QRCODE_SIZE, QRCODE_SIZE,
			hints);
	int width = bitMatrix.getWidth();
	int height = bitMatrix.getHeight();
	BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
	for (int x = 0; x < width; x++) {
		for (int y = 0; y < height; y++) {
			image.setRGB(x, y, bitMatrix.get(x, y) ? 0xFF000000 : 0xFFFFFFFF);
		}
	}
	if (imgPath == null || "".equals(imgPath)) {
		return image;
	}
	// 插入图片
	QRCodeUtil.insertImage(image, imgPath, needCompress);
	return image;
}

/**
 * 在生成的二维码中插入图片
 * @param source
 * @param imgPath
 * @param needCompress
 * @throws Exception
 */
private static void insertImage(BufferedImage source, String imgPath, boolean needCompress) throws Exception {
	File file1 = new File(imgPath);
	if (!file1.exists()) {
		System.err.println("" + imgPath + "   该文件不存在！");
		return;
	}
	Image src = ImageIO.read(new File(imgPath));
	int width = src.getWidth(null);
	int height = src.getHeight(null);
	if (needCompress) { // 压缩LOGO
		if (width > WIDTH) {
			width = WIDTH;
		}
		if (height > HEIGHT) {
			height = HEIGHT;
		}
		Image image = src.getScaledInstance(width, height, Image.SCALE_SMOOTH);
		BufferedImage tag = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
		Graphics g = tag.getGraphics();
		g.drawImage(image, 0, 0, null); // 绘制缩小后的图
		g.dispose();
		src = image;
	}
	// 插入LOGO
	Graphics2D graph = source.createGraphics();
	int x = (QRCODE_SIZE - width) / 2;
	int y = (QRCODE_SIZE - height) / 2;
	graph.drawImage(src, x, y, width, height, null);
	Shape shape = new RoundRectangle2D.Float(x, y, width, width, 6, 6);
	graph.setStroke(new BasicStroke(3f));
	graph.draw(shape);
	graph.dispose();
}

/**
 * 生成带logo二维码，并保存到磁盘
 * @param content
 * @param imgPath	logo图片
 * @param destPath
 * @param needCompress
 * @throws Exception
 */
public static void encode(String content, String imgPath, String destPath, boolean needCompress,String file) throws Exception {
	BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
	mkdirs(destPath);
	
	ImageIO.write(image, FORMAT_NAME, new File(destPath + "/" + file));
}

public static void mkdirs(String destPath) {
	File file = new File(destPath);
	// 当文件夹不存在时，mkdirs会自动创建多层目录，区别于mkdir。(mkdir如果父目录不存在则会抛出异常)
	if (!file.exists() && !file.isDirectory()) {
		file.mkdirs();
	}
}

public static void encode(String content, String imgPath, String destPath,String file) throws Exception {
	QRCodeUtil.encode(content, imgPath, destPath, false ,file);
}

public static void encode(String content, String destPath, boolean needCompress,String file) throws Exception {
	QRCodeUtil.encode(content, null, destPath, needCompress,file);
}

public static void encode(String content, String destPath,String file) throws Exception {
	QRCodeUtil.encode(content, null, destPath, false,file);
}

public static void encode(String content, String imgPath, OutputStream output, boolean needCompress)
		throws Exception {
	BufferedImage image = QRCodeUtil.createImage(content, imgPath, needCompress);
	ImageIO.write(image, FORMAT_NAME, output);
}

public static void encode(String content, OutputStream output) throws Exception {
	QRCodeUtil.encode(content, null, output, false);
}


/**
 * 从二维码中，解析数据
 * @param file	二维码图片文件
 * @return	 返回从二维码中解析到的数据值
 * @throws Exception
 */
public static String decode(File file) throws Exception {
	BufferedImage image;
	image = ImageIO.read(file);
	if (image == null) {
		return null;
	}
	BufferedImageLuminanceSource source = new BufferedImageLuminanceSource(image);
	BinaryBitmap bitmap = new BinaryBitmap(new HybridBinarizer(source));
	Result result;
	Hashtable hints = new Hashtable();
	hints.put(DecodeHintType.CHARACTER_SET, CHARSET);
	result = new MultiFormatReader().decode(bitmap, hints);
	String resultStr = result.getText();
	return resultStr;
}

public static String decode(String path) throws Exception {
	return QRCodeUtil.decode(new File(path));
}

}